Centering device



K. R. STARKENBERG.

CENTERING DEVICE.

APPLICATION HLED APR.27. 1918.

1,328,213. Pamed 1311.18, 1920.

2 SHEETS-SHEET l.

K. R. STARKENBERG.

CENTERING DVICE.

APPLICATION HLED APR.21. 1918,

Pamed Jan. 13,'1920Q 2 SHEETS-SHEET 2.

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Unrrnn sn'tzirns4 PATENT oFFIcn.,

KARL ROBERT STAR`Klill\l`BERGr,v OF ANDOVE, MASSACHUSETTS', ASSIGNORTO JOHN i PETB'OSKE, OF METHUEN, MASSACHUSETTS. i w i CENTERING DEVICE.

Application filed April 27, 1918.

To aZZ 'witam it may concern:

Be it known that I, KARL ROBERT STAR- KENBERG, a citizen of Sweden, residing at Andover, in the county of Essex and State of Massachusetts, have invented new and useful Improvements in Centcring Devices, of which the following is a specification.

This invention relates to a centering device, and the object is to provide an improved construction which shall be more efiicient than those heretofore employed in instruments of the Character indicated.

A further object is to provide `a device including a plurality of movable jaws and a central punch, with certain novel means for mounting and Operating the j aws.

A still further object `1s to provide a plurality of jaws movable toward and away from the central pin constituting a punch or marking device, said pin being under the control of a spring, and the movable jaws being under the control of a plurality of pivoted arms each of which is in turn pivoted to an arm of an Operating member comprising a central element through which the pin passes and a plurality of radially extending devices one of which constitutes an operating lever.

With the foregoing and other objects in view the invention consists in the novel construction, combination, and arrangement of elements hereinafter described and claimed.

In the accompanying drawings:

Figure 1 is a view in elevati-on.

Fig. 2 is a view in elevation from the opposite side of the device.

Fig. 3 is a further elevation looking from the right in Fig. 1.

Fig. 4 is a section on approximately the Vertical axis of F ig. 1.

Fig. 5 is a view similar to Fig. 1 with the jaws or movable members in open position.

A hub vmember 10 is centrally apertured as shown at 11 and serves to mount a plurality of radially extending arms equally spaced from each other and preferably three in number, these arms being designated 12, 13, and 14. It will be observed from the drawings that the angle between the arms is approximately 120 degrees. The arms may Specification of Letters Patent.

Patentea Jan. 13, 1920.

serial No. 281,226.

be threaded into the hub as shown in Fig. 4:, but the manner of effecting the connection is unimportant. Each arm serves to mount a slidab-le jaw member comprising a main portion 15 and a device 16 adapted todirectly engage the outer surface of the stock to be centered. The device is adapted for ascertaining the center of all kinds of round stock within 'reasonable limits. Each jaw is apertured for the purpose of mounting the member, as a whole, on the radially extending arm. A member 18 provides for pivotal connection with an arm 19.

Each member 19 is pivotally connected with one radially extending arm 20 'of an Operating member including the arms last named and a hub member 21 apertured for the accommodation of a pin 22. One of the arms 20 last named is longer than the others and provides means for manually controlling the Operating member. A washer 24 is located between the hub member of the Operating device and the hub member 10.

The centering pin passes through a sleeve 25 within which is mounted a coil spring 26. The sleeve, which is secured to element 21, is provided with a flange 27 on the outer end and a collar 28 carried by the pin abutting this fiange limits the movement of the pin in one direction. The spring engages .the collar on the opposite side and also bears against the surface of the Operating member at its central portion.v Normally the pin is eld in a position with its pointed end retracted, but after the stock has been placed in position between the jaws, and the latter have been forced into contact with the outer' surface of the stock, the center being thereby ascertained, the pin may be driven inwardly in order to make a slight indentation in the end of the stock, indicating the correct center. The stock to be centered is placed between the radially mounted jaws including the elements 16 thereof, and the movement of arm 20 constituting a handle member, in the required direction, causes the jaws to approach the stock and come into engagement therewith all of the elements 16 of course being in positive contact with the stock.

What is claimed is: In a device of the class described, a hub member provided with a central z perture, a

pin slidable therein, radial arms mounted in 5 the, hub member, the angle between the arms being approximately 120 degrees, jaws slidable on the arms, an Operating member comprising a hub element through which the pin passes and on which said pin is mounted and arms radiating Jfrom the hub last named, 10 and means pivotally connecting each of the arms last menti-oned with one of the jaws.

In testimony whereof I affix my signature.

KARL ROBERT STARKENBERG. 

